Product pictures Product Overview: Emerson SP4401 Parameter Specification Manufacturer Emerson Order Number SP4401 Product Name High-performance AC drive / variable speed inverter Series / Family Unidrive SP (neighbouring codes include SP3402, SP3403, SP2401 and SP4401) Application & Fault Scenarios Suitable for 400V three-phase motors on rolling mills, crushers, large fans, pumps, mining hoists and heavy process lines requiring stable speed and high torque. Typical faults: